diff options
Diffstat (limited to 'arch/s390/appldata/appldata_base.c')
| -rw-r--r-- | arch/s390/appldata/appldata_base.c | 544 |
1 files changed, 544 insertions, 0 deletions
diff --git a/arch/s390/appldata/appldata_base.c b/arch/s390/appldata/appldata_base.c new file mode 100644 index 000000000..9bf8489df --- /dev/null +++ b/arch/s390/appldata/appldata_base.c @@ -0,0 +1,544 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Base infrastructure for Linux-z/VM Monitor Stream, Stage 1. + * Exports appldata_register_ops() and appldata_unregister_ops() for the + * data gathering modules. + * + * Copyright IBM Corp. 2003, 2009 + * + * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com> + */ + +#define KMSG_COMPONENT "appldata" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include <linux/module.h> +#include <linux/sched/stat.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/errno.h> +#include <linux/interrupt.h> +#include <linux/proc_fs.h> +#include <linux/mm.h> +#include <linux/swap.h> +#include <linux/pagemap.h> +#include <linux/sysctl.h> +#include <linux/notifier.h> +#include <linux/cpu.h> +#include <linux/workqueue.h> +#include <linux/suspend.h> +#include <linux/platform_device.h> +#include <asm/appldata.h> +#include <asm/vtimer.h> +#include <linux/uaccess.h> +#include <asm/io.h> +#include <asm/smp.h> + +#include "appldata.h" + + +#define APPLDATA_CPU_INTERVAL 10000 /* default (CPU) time for + sampling interval in + milliseconds */ + +#define TOD_MICRO 0x01000 /* nr. of TOD clock units + for 1 microsecond */ + +static struct platform_device *appldata_pdev; + +/* + * /proc entries (sysctl) + */ +static const char appldata_proc_name[APPLDATA_PROC_NAME_LENGTH] = "appldata"; +static int appldata_timer_handler(struct ctl_table *ctl, int write, + void __user *buffer, size_t *lenp, loff_t *ppos); +static int appldata_interval_handler(struct ctl_table *ctl, int write, + void __user *buffer, + size_t *lenp, loff_t *ppos); + +static struct ctl_table_header *appldata_sysctl_header; +static struct ctl_table appldata_table[] = { + { + .procname = "timer", + .mode = S_IRUGO | S_IWUSR, + .proc_handler = appldata_timer_handler, + }, + { + .procname = "interval", + .mode = S_IRUGO | S_IWUSR, + .proc_handler = appldata_interval_handler, + }, + { }, +}; + +static struct ctl_table appldata_dir_table[] = { + { + .procname = appldata_proc_name, + .maxlen = 0, + .mode = S_IRUGO | S_IXUGO, + .child = appldata_table, + }, + { }, +}; + +/* + * Timer + */ +static struct vtimer_list appldata_timer; + +static DEFINE_SPINLOCK(appldata_timer_lock); +static int appldata_interval = APPLDATA_CPU_INTERVAL; +static int appldata_timer_active; +static int appldata_timer_suspended = 0; + +/* + * Work queue + */ +static struct workqueue_struct *appldata_wq; +static void appldata_work_fn(struct work_struct *work); +static DECLARE_WORK(appldata_work, appldata_work_fn); + + +/* + * Ops list + */ +static DEFINE_MUTEX(appldata_ops_mutex); +static LIST_HEAD(appldata_ops_list); + + +/*************************** timer, work, DIAG *******************************/ +/* + * appldata_timer_function() + * + * schedule work and reschedule timer + */ +static void appldata_timer_function(unsigned long data) +{ + queue_work(appldata_wq, (struct work_struct *) data); +} + +/* + * appldata_work_fn() + * + * call data gathering function for each (active) module + */ +static void appldata_work_fn(struct work_struct *work) +{ + struct list_head *lh; + struct appldata_ops *ops; + + mutex_lock(&appldata_ops_mutex); + list_for_each(lh, &appldata_ops_list) { + ops = list_entry(lh, struct appldata_ops, list); + if (ops->active == 1) { + ops->callback(ops->data); + } + } + mutex_unlock(&appldata_ops_mutex); +} + +/* + * appldata_diag() + * + * prepare parameter list, issue DIAG 0xDC + */ +int appldata_diag(char record_nr, u16 function, unsigned long buffer, + u16 length, char *mod_lvl) +{ + struct appldata_product_id id = { + .prod_nr = {0xD3, 0xC9, 0xD5, 0xE4, + 0xE7, 0xD2, 0xD9}, /* "LINUXKR" */ + .prod_fn = 0xD5D3, /* "NL" */ + .version_nr = 0xF2F6, /* "26" */ + .release_nr = 0xF0F1, /* "01" */ + }; + + id.record_nr = record_nr; + id.mod_lvl = (mod_lvl[0]) << 8 | mod_lvl[1]; + return appldata_asm(&id, function, (void *) buffer, length); +} +/************************ timer, work, DIAG <END> ****************************/ + + +/****************************** /proc stuff **********************************/ + +#define APPLDATA_ADD_TIMER 0 +#define APPLDATA_DEL_TIMER 1 +#define APPLDATA_MOD_TIMER 2 + +/* + * __appldata_vtimer_setup() + * + * Add, delete or modify virtual timers on all online cpus. + * The caller needs to get the appldata_timer_lock spinlock. + */ +static void __appldata_vtimer_setup(int cmd) +{ + u64 timer_interval = (u64) appldata_interval * 1000 * TOD_MICRO; + + switch (cmd) { + case APPLDATA_ADD_TIMER: + if (appldata_timer_active) + break; + appldata_timer.expires = timer_interval; + add_virt_timer_periodic(&appldata_timer); + appldata_timer_active = 1; + break; + case APPLDATA_DEL_TIMER: + del_virt_timer(&appldata_timer); + if (!appldata_timer_active) + break; + appldata_timer_active = 0; + break; + case APPLDATA_MOD_TIMER: + if (!appldata_timer_active) + break; + mod_virt_timer_periodic(&appldata_timer, timer_interval); + } +} + +/* + * appldata_timer_handler() + * + * Start/Stop timer, show status of timer (0 = not active, 1 = active) + */ +static int +appldata_timer_handler(struct ctl_table *ctl, int write, + void __user *buffer, size_t *lenp, loff_t *ppos) +{ + int timer_active = appldata_timer_active; + int zero = 0; + int one = 1; + int rc; + struct ctl_table ctl_entry = { + .procname = ctl->procname, + .data = &timer_active, + .maxlen = sizeof(int), + .extra1 = &zero, + .extra2 = &one, + }; + + rc = proc_douintvec_minmax(&ctl_entry, write, buffer, lenp, ppos); + if (rc < 0 || !write) + return rc; + + spin_lock(&appldata_timer_lock); + if (timer_active) + __appldata_vtimer_setup(APPLDATA_ADD_TIMER); + else + __appldata_vtimer_setup(APPLDATA_DEL_TIMER); + spin_unlock(&appldata_timer_lock); + return 0; +} + +/* + * appldata_interval_handler() + * + * Set (CPU) timer interval for collection of data (in milliseconds), show + * current timer interval. + */ +static int +appldata_interval_handler(struct ctl_table *ctl, int write, + void __user *buffer, size_t *lenp, loff_t *ppos) +{ + int interval = appldata_interval; + int one = 1; + int rc; + struct ctl_table ctl_entry = { + .procname = ctl->procname, + .data = &interval, + .maxlen = sizeof(int), + .extra1 = &one, + }; + + rc = proc_dointvec_minmax(&ctl_entry, write, buffer, lenp, ppos); + if (rc < 0 || !write) + return rc; + + spin_lock(&appldata_timer_lock); + appldata_interval = interval; + __appldata_vtimer_setup(APPLDATA_MOD_TIMER); + spin_unlock(&appldata_timer_lock); + return 0; +} + +/* + * appldata_generic_handler() + * + * Generic start/stop monitoring and DIAG, show status of + * monitoring (0 = not in process, 1 = in process) + */ +static int +appldata_generic_handler(struct ctl_table *ctl, int write, + void __user *buffer, size_t *lenp, loff_t *ppos) +{ + struct appldata_ops *ops = NULL, *tmp_ops; + struct list_head *lh; + int rc, found; + int active; + int zero = 0; + int one = 1; + struct ctl_table ctl_entry = { + .data = &active, + .maxlen = sizeof(int), + .extra1 = &zero, + .extra2 = &one, + }; + + found = 0; + mutex_lock(&appldata_ops_mutex); + list_for_each(lh, &appldata_ops_list) { + tmp_ops = list_entry(lh, struct appldata_ops, list); + if (&tmp_ops->ctl_table[2] == ctl) { + found = 1; + } + } + if (!found) { + mutex_unlock(&appldata_ops_mutex); + return -ENODEV; + } + ops = ctl->data; + if (!try_module_get(ops->owner)) { // protect this function + mutex_unlock(&appldata_ops_mutex); + return -ENODEV; + } + mutex_unlock(&appldata_ops_mutex); + + active = ops->active; + rc = proc_douintvec_minmax(&ctl_entry, write, buffer, lenp, ppos); + if (rc < 0 || !write) { + module_put(ops->owner); + return rc; + } + + mutex_lock(&appldata_ops_mutex); + if (active && (ops->active == 0)) { + // protect work queue callback + if (!try_module_get(ops->owner)) { + mutex_unlock(&appldata_ops_mutex); + module_put(ops->owner); + return -ENODEV; + } + ops->callback(ops->data); // init record + rc = appldata_diag(ops->record_nr, + APPLDATA_START_INTERVAL_REC, + (unsigned long) ops->data, ops->size, + ops->mod_lvl); + if (rc != 0) { + pr_err("Starting the data collection for %s " + "failed with rc=%d\n", ops->name, rc); + module_put(ops->owner); + } else + ops->active = 1; + } else if (!active && (ops->active == 1)) { + ops->active = 0; + rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC, + (unsigned long) ops->data, ops->size, + ops->mod_lvl); + if (rc != 0) + pr_err("Stopping the data collection for %s " + "failed with rc=%d\n", ops->name, rc); + module_put(ops->owner); + } + mutex_unlock(&appldata_ops_mutex); + module_put(ops->owner); + return 0; +} + +/*************************** /proc stuff <END> *******************************/ + + +/************************* module-ops management *****************************/ +/* + * appldata_register_ops() + * + * update ops list, register /proc/sys entries + */ +int appldata_register_ops(struct appldata_ops *ops) +{ + if (ops->size > APPLDATA_MAX_REC_SIZE) + return -EINVAL; + + ops->ctl_table = kcalloc(4, sizeof(struct ctl_table), GFP_KERNEL); + if (!ops->ctl_table) + return -ENOMEM; + + mutex_lock(&appldata_ops_mutex); + list_add(&ops->list, &appldata_ops_list); + mutex_unlock(&appldata_ops_mutex); + + ops->ctl_table[0].procname = appldata_proc_name; + ops->ctl_table[0].maxlen = 0; + ops->ctl_table[0].mode = S_IRUGO | S_IXUGO; + ops->ctl_table[0].child = &ops->ctl_table[2]; + + ops->ctl_table[2].procname = ops->name; + ops->ctl_table[2].mode = S_IRUGO | S_IWUSR; + ops->ctl_table[2].proc_handler = appldata_generic_handler; + ops->ctl_table[2].data = ops; + + ops->sysctl_header = register_sysctl_table(ops->ctl_table); + if (!ops->sysctl_header) + goto out; + return 0; +out: + mutex_lock(&appldata_ops_mutex); + list_del(&ops->list); + mutex_unlock(&appldata_ops_mutex); + kfree(ops->ctl_table); + return -ENOMEM; +} + +/* + * appldata_unregister_ops() + * + * update ops list, unregister /proc entries, stop DIAG if necessary + */ +void appldata_unregister_ops(struct appldata_ops *ops) +{ + mutex_lock(&appldata_ops_mutex); + list_del(&ops->list); + mutex_unlock(&appldata_ops_mutex); + unregister_sysctl_table(ops->sysctl_header); + kfree(ops->ctl_table); +} +/********************** module-ops management <END> **************************/ + + +/**************************** suspend / resume *******************************/ +static int appldata_freeze(struct device *dev) +{ + struct appldata_ops *ops; + int rc; + struct list_head *lh; + + spin_lock(&appldata_timer_lock); + if (appldata_timer_active) { + __appldata_vtimer_setup(APPLDATA_DEL_TIMER); + appldata_timer_suspended = 1; + } + spin_unlock(&appldata_timer_lock); + + mutex_lock(&appldata_ops_mutex); + list_for_each(lh, &appldata_ops_list) { + ops = list_entry(lh, struct appldata_ops, list); + if (ops->active == 1) { + rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC, + (unsigned long) ops->data, ops->size, + ops->mod_lvl); + if (rc != 0) + pr_err("Stopping the data collection for %s " + "failed with rc=%d\n", ops->name, rc); + } + } + mutex_unlock(&appldata_ops_mutex); + return 0; +} + +static int appldata_restore(struct device *dev) +{ + struct appldata_ops *ops; + int rc; + struct list_head *lh; + + spin_lock(&appldata_timer_lock); + if (appldata_timer_suspended) { + __appldata_vtimer_setup(APPLDATA_ADD_TIMER); + appldata_timer_suspended = 0; + } + spin_unlock(&appldata_timer_lock); + + mutex_lock(&appldata_ops_mutex); + list_for_each(lh, &appldata_ops_list) { + ops = list_entry(lh, struct appldata_ops, list); + if (ops->active == 1) { + ops->callback(ops->data); // init record + rc = appldata_diag(ops->record_nr, + APPLDATA_START_INTERVAL_REC, + (unsigned long) ops->data, ops->size, + ops->mod_lvl); + if (rc != 0) { + pr_err("Starting the data collection for %s " + "failed with rc=%d\n", ops->name, rc); + } + } + } + mutex_unlock(&appldata_ops_mutex); + return 0; +} + +static int appldata_thaw(struct device *dev) +{ + return appldata_restore(dev); +} + +static const struct dev_pm_ops appldata_pm_ops = { + .freeze = appldata_freeze, + .thaw = appldata_thaw, + .restore = appldata_restore, +}; + +static struct platform_driver appldata_pdrv = { + .driver = { + .name = "appldata", + .pm = &appldata_pm_ops, + }, +}; +/************************* suspend / resume <END> ****************************/ + + +/******************************* init / exit *********************************/ + +/* + * appldata_init() + * + * init timer, register /proc entries + */ +static int __init appldata_init(void) +{ + int rc; + + init_virt_timer(&appldata_timer); + appldata_timer.function = appldata_timer_function; + appldata_timer.data = (unsigned long) &appldata_work; + + rc = platform_driver_register(&appldata_pdrv); + if (rc) + return rc; + + appldata_pdev = platform_device_register_simple("appldata", -1, NULL, + 0); + if (IS_ERR(appldata_pdev)) { + rc = PTR_ERR(appldata_pdev); + goto out_driver; + } + appldata_wq = alloc_ordered_workqueue("appldata", 0); + if (!appldata_wq) { + rc = -ENOMEM; + goto out_device; + } + + appldata_sysctl_header = register_sysctl_table(appldata_dir_table); + return 0; + +out_device: + platform_device_unregister(appldata_pdev); +out_driver: + platform_driver_unregister(&appldata_pdrv); + return rc; +} + +__initcall(appldata_init); + +/**************************** init / exit <END> ******************************/ + +EXPORT_SYMBOL_GPL(appldata_register_ops); +EXPORT_SYMBOL_GPL(appldata_unregister_ops); +EXPORT_SYMBOL_GPL(appldata_diag); + +#ifdef CONFIG_SWAP +EXPORT_SYMBOL_GPL(si_swapinfo); +#endif +EXPORT_SYMBOL_GPL(nr_threads); +EXPORT_SYMBOL_GPL(nr_running); +EXPORT_SYMBOL_GPL(nr_iowait); |